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844256DGLFT

Description
clock synthesizer / jitter cleaner fanout buffer
Categorysemiconductor    Other integrated circuit (IC)   
File Size785KB,18 Pages
ManufacturerIDT (Integrated Device Technology, Inc.)
Websitehttp://www.idt.com/
Environmental Compliance  
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844256DGLFT Overview

clock synthesizer / jitter cleaner fanout buffer

844256DGLFT Parametric

Parameter NameAttribute value
ManufactureIDT (Integrated Device Technology)
Product CategoryClock Synthesizer / Jitter Cleane
RoHSYes
Package / CaseTSSOP-24
PackagingReel
Factory Pack Quantity2500
FemtoClock
®
Crystal-to-LVDS Frequency
Synthesizer w/Integrated Fanout Buffer
ICS844256D
DATA SHEET
General Description
The ICS844256D is a Crystal-to-LVDS Clock Synthesizer/Fanout
Buffer designed for SONET and Gigabit Ethernet applications. The
output frequency can be set using the frequency select pins and a
25MHz crystal for Ethernet frequencies, or a 19.44MHz crystal for
SONET. The low phase noise characteristics of the ICS844256D
make it an ideal clock for these demanding applications.
Features
Six differential LVDS output pairs
Crystal oscillator interface
Output frequency range: 62.5MHz - 625MHz
Crystal input frequency range:15.625MHz - 25.5MHz
RMS phase jitter @ 125MHz, using a 25MHz crystal
(1.875MHz – 20MHz): 0.43ps (typical)
Full 3.3V or mixed 3.3V core, 2.5V output supply mode
0°C to 70°C ambient operating temperature
Available in lead-free (RoHS 6) package
Function
Divider Function Table
Inputs
FB_SEL
0
0
0
0
1
1
1
1
N_SEL1
0
0
1
1
0
0
1
1
N_SEL0
0
1
0
1
0
1
0
1
M Divider Value
25
25
25
25 (default)
32
32
32
32
N Divider Value
1
2
4
5
1
2
4
8
M/N Divider Value
25
12.5
6.25
5
32
16
8
4
Block Diagram
Q0
PLL_BYPASS
Pullup
nQ0
Q1
1
Pin Assignment
V
DDO
V
DDO
nQ2
Q2
nQ1
Q1
nQ0
Q0
PLL_BYPASS
V
DDA
V
DD
FB_SEL
XTAL_IN
OSC
XTAL_OUT
PLL
0
N
Output
Divider
nQ1
Q2
nQ2
Q3
M
Feedback
Divider
FB_SEL
Pulldown
N_SEL1
Pullup
nQ3
Q4
nQ4
Q5
nQ5
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
Q3
nQ3
Q4
nQ4
Q5
nQ5
N_SEL1
GND
GND
N_SEL0
XTAL_OUT
XTAL_IN
ICS844256D
24-Lead TSSOP, E-Pad
4.40mm x 7.8mm x 0.925mm
package body
G Package
Top View
N_SEL0
Pullup
ICS844256DG REVISION A AUGUST 5, 2010
1
©2010 Integrated Device Technology, Inc.
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